Before smartphones were as common as they are today, feature phones reigned supreme. One exceptionally amazing thing about those feature phones was that if you were low on battery, you could turn them off and it would still sound an alarm that you had set for it. With smartphones, you can no longer do that. I remember the first time my iPhone was low on battery and all I could do to conserve it so that it would last the night was turn on Airplane mode. This meant I wouldn’t be able to connect to the internet nor would I get any calls or emergency texts. With iOS 9, Apple has introduced a new Low Battery Power mode that conserves the battery but keeps radio switches on. Here’s how you can enable it.
Open the Settings app and go to Battery. Here you will see the Low Power Mode option that you can turn on. When enabled, the battery indicator in the status bar turns yellow as shown in the screenshots below. You can enable Low Power Mode even if you’re device is plugged in and charging however, iOS will automatically exit it once it’s reached 80% charge.
If you’re looking for a somewhat similar solution on an iOS device but do not have iOS 9, what you can do is turn off background refresh for apps since that is one of the main things this mode does. You’d be surprised how much battery apps refreshing in the background can consume. If you want to keep background refresh for apps on, consider turning it off for only the more taxing apps which at least in my case was Facebook.